化学成分对中钛高炉渣矿物组成影响的热力学分析

Thermodynamic Analysis on Effects of Chemical Composition on Mineral Composition in Medium-titanium Blast Furnace Slag

采用FACTSage 7.0热力学软件计算了中钛高炉渣结晶过程的平衡物相组成，分析了不同化学成分对中钛渣矿物析出过程和矿物组成的影响规律。结果表明，中钛高炉渣冷却过程中析出的物相主要有黄长石、钙钛矿、尖晶石与透辉石。当碱度较低时（R〈0.93），渣中不存在单独的钙钛矿相。当碱度超过1.03继续增加时，黄长石含量增加，尖晶石含量降低。碱度越高越有利于钙钛矿的形成。随着TiO2含量的增加，中钛渣中黄长石含量减少而钙钛矿含量增加；并且随着温度的降低，钛元素逐渐富集，最终转移到钙钛矿中。渣中MgO含量或Al2O3含量的增加，使得中钛渣矿物析出过程的变得复杂，且影响了钛元素的析出过程。

The equilibrium mineral components in the crystallization process furnace slag are calculated by using FACTSage 7.0 thermodynamics software, of medium-titanium blast and the influence of differ- ent chemical composition on mineral precipitation process and mineral composition of medium-titanium blast furnace slag are analyzed. The results show that in the cooling process of medium titanium blast fur- nace slag, the precipitation phases mainly are melilite, perovskite, spinel and diopside. There is no sin- gle perovskite phase existing in the slag when alkalinity is low （R〈0.93） ; when the basicity is more than 1.03 and continues to increase, the content of melilite increases, however, the content of spinel is lower. The higher alkalinity is more conducive to form the perovskite. Due to the increase of TiO2 content, the content of melilite on medium-titanium slag decreases with increasing perovskite content. And with the temperature decreasing, the titanium enriches into titania spinel firstly, and finally moves into perovskite phase. The mineral precipitation process becomes more complicated with the increase of MgO or A1203 content in the slag, which has an significant influence on the precipitation of titanium.